Versions/RU-282883

Update Information

 * Gantry is now a part of th Basic Rocketry research tech.
 * Fixed a crash that could occur when opening the starmap.
 * Fixed a crash that could occur when loading a dupe in the plumber role.
 * Fixed a crash that could occur when placing the Gantry.
 * Mission duration scale changed to 3 cycles / distance.
 * Added description and codex entry for Gassy Moo.
 * New build menu rocketry icon.